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DIGITAL ANTENNA SELECTOR
Let Alpha/Power's "DAS" Change Antennas For You...AUTOMATICALLY!

IN ITS MOST COMMON APPLICATION...The Digital Antenna Selector (DAS) plugs into the ALPHA 87A RS-232 port and is programmed from the '87A's front panel. It can drive commonly available relay boxes to automatically switch in any one of up to 9 different antennas on each of the 9 HF amateur bands.

For programming the DAS from the ALPHA 87A panel, the "BAND" buttons are dual-purpose: touch only a BAND button and you change the amplifier band; but if you touch ENTER first, each of the 9 BAND buttons becomes a corresponding (#1 - #9) antenna selection button.

When used with an '87A the Digital Antenna Selector "remembers" the most recently programmed selection on each band until you change it. And the DAS is interlocked against hot switching-just patch your T/R relay line through it and you can't accidentally switch antennas with the key down.

DAS CAN BE COMPUTER-CONTROLLED, TOO -
It's perfect with CT(tm) & PacketCluster(tm). You can select antennas at a keystroke, whether you're using an ALPHA 87A or any other amplifier. And the DAS provides two RS-232 ports to allow convenient daisy-chaining.

DAS IS PROBABLY COMPATIBLE WITH THE RELAYS YOU'RE ALREADY USING -
It's conveniently compatible with virtually any remote antenna selection box that uses relays. The internal 120V AC power supply is capable of delivering up to 24V DC at 500 mA, enough to handle any likely combination of relay coil loads. Coil drivers are relay-isolated to protect DAS circuitry against RF and static electricity.

ADD MORE RELAY BOXES AND THE DAS CAN CONTROL UP TO 36 ANTENNAS -
Alpha/Power's Digital Antenna Selector also can handle as many as 36 antennas by driving up to seven 6-way RF relay boxes. One box can feed up to six more, any or all of which may be remoted. It's possible to switch instantly among 6 antennas at each of 6 towers.

Setting up to control such a two-tier fanout of Redlines requires simply resetting a DIP switch inside the DAS. The push-button antenna selection system changes slightly: the 36 possible antenna ports are identified as A 1 through F6, corresponding on the DAS panel to the two rows of buttons labeled A-to-F and 1-to-6. Manual antenna selection consists simply of touching one button in each row.

When controlling this system from the '87A front panel, each of the first six '87A BAND buttons represents both "A-F' end "1-6". To pick any one of 36 antennas, first touch ENTER, then the BAND button representing the desired output relay box A-F, followed by the BAND button representing the desired port 1-6 of that box. It's much easier and faster to do than to describe... takes only a second.

The DAS is approximately 3.1" H x 10.1" W x 6.8" D, and it weighs approximately 4 pounds.